serverless-(aws-)terraform-outputs

Provides variable substitution resolution from Terraform outputs.

It support terraform workspace managed on :

• s3 bucket
• local path using terraform command.

Usage

You can install this version with the name serverless-aws-terraform-outputs rather than serverless-terraform-outputs

npm install serverless-aws-terraform-outputs

We could use serverless-terraform-outputs when this pull request will be (or not) accepted (see rundeck#7)

With state stored on s3

plugins:
  - serverless-aws-terraform-outputs

custom:
    stage: ${opt:stage, self:provider.stage}
    tf_workspace_foo: s3://my-state_bucket/main-account/eu-west-1/foo/${self:custom.stage}
    tf_workspace_bar: s3://my-state_bucket/main-account/eu-west-1/bar/${self:custom.stage}

provider:
    environment:
        SQS_QUEUE: ${terraform:${self:custom.tf_workspace_foo}:sqs_queue_stuff_url}
        ROLE_ARN: ${terraform:${self:custom.tf_workspace_bar}:my_role_arn}

Internaly, this plugin will load state from s3://state_bucket/main-account/eu-west-1/foo/${self:custom.stage}/terraform.tfstate as specified in custom.tf_workspace_foo, and resolve output sqs_queue_stuff_url

As you could see, you can use several terraform workspace, if your resources came from several stack.

With state stored localy

Prerequisites

Requires Terraform to be installed and accessible via the path, as well as minimal backend config: main.tf:

terraform {
    required_version = "0.12.26"
    backend "s3" {
        region               = "us-west-2"
        key                  = "project/foo"
        bucket               = "foosoft-terraform"
    }
}

For outputs from multiple Terraform configurations it is recommended to set them up as data sources and re-export the required vars.

Example

custom:
    stage: ${opt:stage, self:provider.stage}
    tf_workspace: ${self:custom.stage}

provider:
    environment:
        SQS_QUEUE: ${terraform:${self:custom.tf_workspace}:sqs_queue_stuff.value.url}

Configuration

Optionally, you can configure the plugin:

custom:
    terraformOutputs:
        cwd: dir/with/terraform/files

Parameter Name	Default Value	Description
cwd	(project base dir)	The directory where terraform outputs will be executed in, relative to the project base directory

Change log

0.1.0

• use serverless-aws-terraform-outputs name in order to use this version before original project will be updated.

• add dependency on "aws-sdk" and aws client to retreive shared terraform state stored on S3.

• introduce TFWorkspace to load several workspace

• rename output to load_output in terraform js (avoid confusion of stored result)

• in terraform state file:

  • if not specified, retreive last 'value' member of key path
  • if not specified, retreive first 'outputs' member of key path

0.0.4

All previous work from Rundesk:

• initial project tree using typescript
• serverless plugin declaration
• use of local terraform command to load output